Frictional spring-dampener.



No. 766,102. PATENTED JULY 26, 1904. E. DENBGRB.

PRIGTION'AL SPRING DAMPENBR.

APPLIOATION FILED DECLE. 1903 N0 MODEL.

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No. 766,102. Patented July 26, 1904.

UNITED STATES PATENT OEETQE.

EDII'ARI) DENEGRE, OF CHICAGO, ILLINOIS, ASSIGNOR TO MoCORl) & COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NINA" JERSEY.

FRICTIONAL SPRlNG-DAMPENER.

SPECIFICATION forming part of Letters Patent No. 766,102, dated July 26, 1904:.

Application filed December 5, 1903. Serial N- l83,848. N0 model.)

T0 10/7/07" it 7/ spring-plank or transom of an ordinary car- Be it known that I, EDWARD Di'iwnoiiiji, a truck and showingoneofmyimprovedspringcitizen of the United States, residing at Chidampeners applied between the said bolster cago, in the county of Cook and State of Illiand spring-plank. Fig. 2 is a front elevation 5 nois, have invented certain new and useful 1111- of the spring-dampener shown in Fig. 1. Fig.

provements in Frictional Spring-Dampeners; 3 is a section on the line w u! of Fig. 2, and 55 and I do hereby declare the following to be a Fig. I is a front elevation of one of the coopfull, clear, and exact description of theinvencrating pairs of frictionally-engaging memtion, such as will enable others skilled in the bers of the spring-dampener. art to which it appertains to make and use the The numeral 1 indicates the side frame, the

same. numeral 2 the truck-bolster, and the numeral 60 My present invention relates to so-called 3 the spring-plank or transom of a car-truck spring-dampeners or vibration-retardof ordinary or standard construction. The ers, and has for its object to improve the truck-bolster is supported in the usual way same in the several particulars hereinafter by coiled springs A, which rest upon a springnoted. base 5, rigidly secured to the spring-plank 3. 65

To the above ends the invention consists of A frictional sprmg-retardmg device 1s made the novel devices and combinations of devices up of a plurality of upper and lower approxihereinafter described, and defined in the mately U-shaped friction-plates 6 and 7, reclaims. spectively. The upper spring-plates 6 have The tendency of coiled springs to vibrate their transverse portions rigidly clamped to- 70 when unrestrained is well known, and to pregether by a split clamping-bar 9. The prongs vent such springs from vibrating excessively of each lower springplate 7 telescope or so-called spring dampeners or ret-arders" slide within the prongs of the corresponding have been incorporated in the spring devices. spring-plate 6. The prongs of the lower mem- Such an arrangement is disclosed and claimed .bers T when released tend to spring into di- 75 in my own prior patent, No. 709,969, of date verging positions, as indicated by dotted lines September 30, 1902, entitled Spring-cushin Fig. 1, and this spring tension normally ion. keeps the said prongs pressed into frictional 0 My present invention is in a sense an imengagement with the embracing-prong of the provement on the form of spring-dampener corresponding upper plate 6. Of course it disclosed and claimed in my said prior patent. might be either the upper or the lower mem- As a radical point of departure, however, bers that require to be sprung into position, my present invention provides a frictional as above stated.

spring-dampener which while arranged to 00- The sections of the clamping-bars 8 and 9 operate with is independent of and disassoare held together and securely anchored, the 5 elated from the springs themselves. former to the truck-bolster 2 and the latter to As another feature of improvement my inthe spring-plank 3, by means of nutted bolts vention provides means for removing or re- 10 and 11. As shown, the bottom member of placing the dampener or retarder and for inthe lower spring-plates T rests on a fillingcreasing or decreasing the capacity thereof block 12, which in turn rests upon the spring-. without interference with the springs thembase 5 of the so-called spring-plank 3. selves. It is evident that the spring dampener or The invention is illustrated in the aecomparetarding device described can be applied in 45 nying drawings, wherein like characters indiworking position or removed therefrom withcate like parts throughout the several views. out disturbing the springs A. It is also evi- Figure 1 is a transverse vertical section dent that the greater the number of pairs of taken through a portion of one side frame pronged friction-plates employed in the damthrough the truck-bolster and through the pener the greater will be its frictional resistance, and consequently the stronger the dampening or retarding action. The converse is also true. It is therefore evident that a spring-dampener of the above character is capable of being readily adjusted or readjusted to the particular work required of it after the supporting-springs have been applied in working position and without interference with the springs. The device described is of extremely small cost, has no parts which are liable to be broken or get out of order, and is efiicient for the purposes had in view.

While I consider it patentably novel to apply between a truck-bolster and a part of the truck frame a frictional spring dampener which is independent of and disassociated from the bolster-supporting springs, I do not, however, limit myself to this particular use, but on the contrary would have it understood that the device may be generally used where such device is desired. All of the features above noted I desire to herein claim.

What I claim, and desire to secure by Letters Patent of the United States, is as follows:

1. The combination with parts to be cushioned and springs applied between them, of a frictional spring-dampener also applied between the said parts, which dampener is disassociated from and independent of said springs, and involves a plurality of frictional members engaging under the spring tension of certain of said members.

2. A spring-dampenermade up of a plurality of approximately U-shaped frictionplates 6 placed one within the other andrigidly tied together, and a plurality of cooperating approximately U-shaped frictionally-engaging plates 7 also rigidly tied together.

3. The combination with a pair of parts to be cushioned, and springs applied between them, of a spring-dampener disassociated from and independent of said springs, said dampener involving a plurality of pairs of interlapping approximately U shaped frictionplates, and means whereby the number of pairs of plates may be increased or decreased, substantially as described.

4. In a car-truck, the combination with a truck bolster, and springs supporting the same, of a frictional spring-dampener applied between said bolster and a part of the truckframe, which spring-dampener is disassociated from and is independent of said springs, substantially as described.

In testimony whereof I afiix my signature in presence of two witnesses. 1

EDWARD DENEGRE.

Witnesses:

JAMES D. DENEGRE, MORRILL DUNN. 

